Neutron spectroscopy of <sup>26</sup>Mg states

Autor(en)

C. Massimi, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Bécares, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowes, S. Bisterzo, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, D. M. Castelluccio, F. Cerutti, E. Chiaveri, L. Cosentino, M. Chin, G. Clai, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, S. Cristallo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, C. Eleftheriadis, A. Ferrari, P. Finocchiaro, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, A. Hernández-Prieto, D. G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimos, N. Kivel, P. Koehler, M. Kokkoris, S. Kopecky, M. Krtička, J. Kroll, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, S. Lo Meo, R. Losito, A. Mallick, A. Manousos, J. Marganiec, T. Martínez, P. F. Mastinu, M. Mastromarco, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaers, A. Musumarra, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, L. Piersanti, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Robles, C. Rubbia, M. Sabaté-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrío, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, I. Van Rijs, V. Variale, P. Vaz, A. Ventura, M. J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiß, R. Wynants, T. Wright, P. Žugec

Abstrakt

This work reports on accurate, high-resolution measurements of the

²⁵Mg(n,γ)

²⁶Mg and

²⁵Mg(n,tot) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved

²⁵Mg(n,γ)

²⁶Mg parametrization. The relevant resonances for n+

²⁵Mg were characterized from a combined R-matrix analysis of the experimental data. This resulted in an unambiguous spin/parity assignment of the corresponding excited states in

²⁶Mg. With this information experimental upper limits of the reaction rates for

²²Ne(α,n)

²⁵Mg and

²²Ne(α,γ)

²⁶Mg were established, potentially leading to a significantly higher (α,n)/(α,γ) ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 M

_⊙.

Organisation(en)

Experimentelle Grundausbildung und Hochschuldidaktik, Isotopenphysik

Externe Organisation(en)

Istituto Nazionale di Fisica Nucleare (INFN), Roma, Università degli Studi di Catania, Università di Bologna, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, Institut pluridisciplinaire Hubert Curien, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, IRFU CEA-Saclay laboratory , University of Manchester, INAF-Osservatorio Astrofisico di Torino, Joint Institute of Nuclear Astrophysics - Center for the Evolution of the Elements, University of Notre Dame, University of Zagreb, European Organization for Nuclear Research (CERN), Universitat Politècnica de Catalunya, Universidade de Lisboa, Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Universidad de Sevilla, Osservatorio Astronomico di Collurania Vincenzo Cerulli, National Technical University of Athens (NTUA), Universitat de València, Universidade de Santiago de Compostela (USC), Paul Scherrer Institute, Aristotle University of Thessaloniki, Bhabha Atomic Research Center, Technische Universität Wien, York University, Karlsruher Institut für Technologie, University of Oslo, European Commission Joint Research Centre, Istituto Nazionale di Fisica Nucleare (INFN), Legnaro, Università degli Studi di Trieste, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, University of Hull, Universität Basel, University of Hertfordshire, Australian National University

Journal

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Band

768

Seiten

1-6

Anzahl der Seiten

ISSN

0370-2693

DOI

https://doi.org/10.1016/j.physletb.2017.02.025

Publikationsdatum

05-2017

Peer-reviewed

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/49a58558-ceb0-461d-ad4b-7b336c3be37a